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Litchi chinensis control points
Litchi pods, also known as hairy spiders, hairy ticks, and felt disease, are spread through wind, insects, nursery stock, or crawling and are harmful to litchi. Distributed in Guangdong, Guangxi, Fujian, Hainan, Sichuan and Yunnan provinces. In recent years, due to the killing of natural enemies, the degree of damage has increased. After investigating litchi cultivars such as Dahongpao, Guiwei, Phoebe nanmu, and Zizixiao in Lizhi Garden, the authors found that young shoots, flowering stages, and seedling stages were most severely affected by cinnamon and nanmu leaves. The victim is lighter. Da Hongpao and the scorpion have not been killed. Small quail eggs, produced in the base of the blade hair, if the pupa, larvae survive between the hairs, dense crowns, poor light, after fruit picking and not control the winter shoots of the orchard, the occurrence of serious damage. Its characteristics and prevention points are described below. First, the morphological characteristics Litchi pupa eggs are spherical, translucent, milky white to pale yellow; nymphs resemble phlegm, grayish white when the first hatch. The corpus callosum is small, only 0.15 mm in length, and it is long and narrow. It has a light-yellow color when it is sucked and sucked. It turns orange-yellow and has a small head and extends forward. If there are only two pairs of feet, the forelimb is in the form of a shield; the length of the hind limb is extended with many rings; the end of the abdomen is tapered, and the back of the distal section is two long hairs. Second, living habits Litchi pueraria occurs more than 10 generations a year, overlapping generations, all the four seasons have emerged. The wintering of the Rugao and Chengyu on the leaves or branches, and the beginning of the loquat between the end of February and the beginning of March of the following year, began to move and gradually moved from the damaged leaves to the spring shoots and flowering ears. In April, it began to multiply. Its occurrence and growth were mainly affected by meteorological conditions. The daily average temperature was 24-30°C, precipitation was high, relative humidity was over 80%, and new shoots were extracted. From May to June, it is a year of severe damage, and young shoots are also affected later, especially during the autumn shoots. Third, the victim's symptoms if the phlegm, sorghum absorb litchi leaves, shoots, flowers and fruit juice, while secreting certain substances, stimulate the epidermal cells, the victim site appears yellow green patches 5-7 days, initial sparse Gray and white fur, then gradually dense, yellow-green to dark brown. Mouth density increased gradually from velvet to yellow-brown, with highest density from yellowish-brown to bright yellow-brown, and less gingival at dark brown. After the leaves were damaged, they formed a felt-like shape, with a loss of luster on the front, unevenness, and severely hindered photosynthesis. Floral enlargement such as inverted clocks clusters, abnormal growth, can not normal flowering results. Young fruit is easy to fall off. Fourth, the prevention and control points 1, the long-term poor management of agricultural cultivation techniques, dense foliage, poor ventilation and light transmission, it is easy to cause large-scale occurrence. After harvesting the fruit, the damaged branches, weak branches, dense branches, shade branches, and dead branches are cut off and burned in a concentrated manner to improve the ventilation and light conditions of the orchard and reduce the source of insects. Do a good job of routine management, rational fertilization, increase tree vigor, and improve plant resistance. Control the winter shoots, worsen and interrupt the source of food, reduce overwhelming winterworms, fundamentally improve resilience, and control damage. 2. Biological control Protection and use of predators and Other natural enemies in the natural world have a positive effect on controlling the number of occurrences of ticks. 3ã€Pharmaceutical control After cutting off pests and leaves in winter, pulverized lime sulfur mixture is used 1000 times once. In the middle and late April, Nisolon + trichlorfon will be sprayed. In the middle and late July, Nisolon + 40% water-containing phosphorothiocyanate will be sprayed. 1000 times liquid, or Nissoline + 40% Omethoate EC 1000 times.
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